The typical way of creating a sub-theme is a completely manual process of copying and renaming certain files and directories. There are instructions in the Omega theme project for creating a sub-theme.
starterkitsdirectory of the newly installed Omega theme located at
omega-html5starter theme. So, right-click on the
omega-html5directory, and click on Copy from the menu.
/sites/all/themesdirectory, and click on Paste.